ATST Telescope Mount Assembly

1
ATSTTelescopeMountAssembly
Requirements Specifications
Mark Warner, January 2006
2
TMA Systems Design ReviewTopics of Discussion

• Overview Charge to Committee (Mark)
• 6 Major Parts of SDR
• SRD Flow-down Error Budgets (Rob Hubbard)
• Specifications (Mark)
• Reference Designs (Bret Goodrich, Mark)
• Lunch
• Performance Analyses (Myung Cho)
• Contracting Approach (Mark)
• Risk Areas (Mark)
• Plans for Future Work (Mark)
• AOB
• Executive Session (closed session for committee
  members)
• Feedback from Committee (All Hands)
• --------------------------------------------------
  ----------------------------------
• Dinner

TMA Specifications
2
January 19, 2006
3
Presentation Overview

• Top-Level Functional Requirements
• Specification Document Summary
• Interface Control Documents
• Safety Requirements
• QA/QC Requirements

TMA Specifications
3
January 19, 2006
4
Top-Level TMA RequirementsOptic Instrument
Mounting

• Requirement Provide stiff, precision mounting
  interfaces for the optic assemblies and
  instruments
• M1-M6 mirror assemblies, heat stop, Lyot stop
  assembly, and calibration optics
• M7-M9 mirror assemblies, coudé instruments
• M3n-M5n Nasmyth optics and instrument

TMA Specifications
4
January 19, 2006
5
Top-Level TMA RequirementsOptic Instrument
Mounting M1-M6
TMA Specifications
5
January 19, 2006
6
Top-Level TMA RequirementsOptic Instrument
Mounting M7-M9
TMA Specifications
6
January 19, 2006
7
Top-Level TMA RequirementsOptic Instrument
Mounting M3n-M5n
TMA Specifications
7
January 19, 2006
8
Top-Level TMA RequirementsPoint, Track, Slew

• Requirement Provide accurate and repeatable
  pointing, tracking and slewing of the optics over
  their full required ranges of travel
• Top-down requirement from open-loop pointing
  (SRD)
• Bottom-up estimates from other large telescope
  as-built performance

TMA Specifications
8
January 19, 2006
9
Top-Level TMA RequirementsLight Path

• Requirement Provide an unobstructed optical path
  from the sun, to/through all optics, to the
  instrument stations at the Nasmyth and coudé
  fociwith acceptable seeing and stray-light
  characteristics
• Top-down requirement (mount seeing) is NA in
  error budget
• Unobstructed, fully shaded structure with low
  thermal mass and ventilation.
• (Bottom-up via thermal analysis of mount
  structure)

TMA Specifications
9
January 19, 2006
10
Top-Level TMA RequirementsInstrument Optic RR

• Requirement Provide for periodic instrument and
  optics RR (e.g., M1 recoating operations)
• Top down requirement from SRD telescope must be
  optimized for efficiency
• Bottom-up requirements from NIC subassembly
  designs

TMA Specifications
10
January 19, 2006
11
Top-Level Functional Requirements (cont.)

• Requirement TMA shall be safe for personnel and
  equipment
• Top down ATST Project Tenet
• Bottom-up
• OSHA HIOSH compliance
• Provide integrated safety systems for personnel
  and telescope (e.g., M1 cover GIS interface,
  etc.)
• Safety reviews
• Etc

TMA Specifications
11
January 19, 2006
12
TMA Specifications Document (SPEC-0011)

• The SD contains all the specifications
  requirements that the Contractor must use when
  designing and constructing the TMA
• Performance, Engineering Functional
  Specifications
• Traceability of specs fall into three major
  categories
• Traceable to SDR (e.g., Jitter, Coincidence of
  Az. Axes)
• Traceable to Use Cases (e.g., Settling Times)
• Traceable to BEP (e.g., Braking, Torque
  Margins, Factors of Safety)
• Contractor required to create a Compliance Matrix
  that includes all numbered specs in SD
• States how spec will be verified (e.g., test,
  inspection, analysis, etc.)
• ? SD organized into 10 Major Subsystems General
  (design, fab, metrology, shipping, assembly)
  Safety requirements

TMA Specifications
12
13
1.1 Mount Structure Requirements

• Performance
• Mount payload definitions
• Overall structure characteristics
• Size, mass, resonant frequency
• Flexure (M1-M6, M3n-M5n displacements)
• Static Dynamic
• Individual Mirror Displacements Rotations
• Line of Sight (LOS) requirements (including
  M7-M9)
• Thermal Deflections
• Seismic
• Assembly Bearing precision
• E.g., perpendicularity of azimuth and altitude
  axes.
• Functional Engineering
• Bearing systems
• Personnel access

TMA Specifications
13
January 19, 2006
14
1.2 Mount Drive Requirements

• Performance
• Alt, Az ranges of travel and limits
• Velocity and acceleration
• Pointing and tracking
• Jitter, stability, drift, settling time
• Engineering Functional
• Encoders
• Over-speed sensing
• Brakes
• Drives (torques, etc.)

TMA Specifications
14
January 19, 2006
15
1.3 Coudé Rotator Structure Requirements

• Performance
• Rotator payload definitions
• Overall structure characteristics
• Size, mass, resonant frequency
• Flexure (M7-M9, instrument displacements)
• Static (dynamic covered above in Mount)
• Individual Mirror Displacements Rotations
• Thermal Deflections
• Seismic
• Assembly Bearing Precision
• E.g., azimuth axis coincident with mount
  structure
• Functional Engineering
• Bearing systems
• Personnel access
• Electronic enclosure requirements

TMA Specifications
15
January 19, 2006
16
1.4 Coudé Rotator Drive Requirements

• Performance
• Azimuth range of travel limits
• Velocity and acceleration
• Pointing and tracking
• Jitter, stability, drift, settling time
• Engineering Functional
• Encoders
• Over-speed sensing
• Brakes
• Drives (torques, etc.)

• (Essentially same requirements as Mount azimuth
  drive requirements)

TMA Specifications
16
January 19, 2006
17
1.5 Nasmyth Rotator Structure Requirements

• Performance
• Nasmyth Instrument payload definitions
• Overall structure characteristics
• Resonant frequency
• Flexure (instrument displacements)
• Static (dynamic covered above in Mount)
• Thermal Deflections
• Seismic
• Assembly Bearing Precision
• E.g., rotation axis coincident with mount
  altitude axis

TMA Specifications
17
January 19, 2006
18
1.6 Nasmyth Drive Requirements

• Performance
• Range of travel limits
• Velocity and acceleration
• Pointing and tracking
• Jitter, stability, drift, settling time
• Engineering Functional
• Encoders
• Over-speed sensing
• Brakes
• Drives (torques, etc.)

TMA Specifications
18
January 19, 2006
19
1.7 Ancillary Mech. Equipment Requirements

• Locking Pin Assemblies
• Positions
• Design Loads Factor of Safety

• OSS Balance System
• (Safety)

TMA Specifications
19
January 19, 2006
20
1.7 Ancillary Mech. Equipment (cont.)

• Enclosure Avoidance System
• (Safety)
• Cable Wraps
• Stiction
• Capacity

TMA Specifications
20
January 19, 2006
21
1.7 Ancillary Mech. Equipment (cont.)

• ?Mirror Cover Assembly
• Fail-safe closure
• Mirror protection

• Thermal Ventilation System?
• Seeing

TMA Specifications
21
January 19, 2006
22
1.7 Ancillary Mech. Equipment (cont.)

• Status Sensing System
• Telescope Health

TMA Specifications
22
January 19, 2006
23
1.8 MCS Requirements
Sequence Controller

• Functional TMA Control
• operational
• startup and initialization
• target acquisition
• on-target operations (offset, scan)
• stow and shutdown
• ITC
• acceptance performance tests
• engineering
• single axis motion
• full control of each component

Online/Offline
Park/Slew/Track
Operations
Offset/Scan
Trajectory
Servo Controller
Power and Enable
Position Velocity
Operations
Index/Home/Datum
Microcode/Constants
Coefficients
Engineering
Motion Profiles
Triggers and Alarms
TMA Specifications
23
January 19, 2006
24
1.8 MCS Requirements (cont.)

• Functional TMA status
• reporting and logging
• component status
• configuration states
• health and alarms
• faults, traces
• performance

Limit switches
Health
Archive torques
Config running/done
Log debug warn
Position and Velocity
Alarm pos vel
Servo Controller
Event Service
Log Service
Health Service
Archive Service
TMA Specifications
24
January 19, 2006
25
1.8 MCS Requirements (cont.)

• Functional Interfacing
• ATST Common Services
• connection and event services
• property service
• log and archive services
• Telescope Control System
• commands
• modes (park, slew, track, )
• trajectories
• status
• Enclosure Control System
• follow ECS

TMA Specifications
25
January 19, 2006
26
1.9 LIC Requirements

• Functional Safety
• detect
• mount-enclosure collision
• end-of-travel, over-speed
• temperature, pressure
• Castell keys, e-stops, doors
• interlock
• directly to hardware power
• report
• to and from GIS
• one-way to MCS
• one-way to engineering display

Mount
Sensors, switches
Logic
Power
Local Interlock Controller
Mount Control System
Global Interlock System
ECS Local Interlock Controller
TMA Specifications
26
January 19, 2006
27
1.10 Telescope Pier Requirements

• Performance
• Stiffness Capacity
• Soil Interface
• Engineering Functional
• Flooring Stairs
• Man-Lift
• Coudé Crane
• Lighting

TMA Specifications
27
January 19, 2006
28
Interface Control Documents

• ICDs define the interfaces between the TMA and
  other NIC subsystems (e.g., M1)
• Each ICD contains 61 major subcategories
• Mechanical (e.g., bolt patterns)
• Optical (e.g., beam clearance)
• Electronic/Electrical (e.g., cabling, power)
• Mass/Balance
• Thermal (e.g., coolant)
• Software/Control
• (Safety Issues)

TMA Specifications
28
January 19, 2006
29
Interface Control Documents (cont.)

• Currently there are 14 identified ICDs that
  touch the TMA
• 1.1/1.2 TMA-to-M1 Assembly
• 1.1/1.4 TMA-to-M2 Assembly (includes HS, Lyot
  Stop)
• 1.1/1.5 TMA-to-Feed Optics
• 1.1/1.7 TMA-to-System Alignment
• 1.1/2.1 TMA-to-Coudé Wavefront
• 1.1/2.2 TMA-to-Nasmyth Wavefront
• 1.1/3.1.1 TMA-to-Polarimetry
• 1.1/3.1.2 TMA-to-Nasmyth Station
• 1.1/4.4 TMA-to-TCS
• 1.1/4.5 TMA-to-GIS
• 1.1/5.0 TMA-to-Enclosure
• 1.1/6.2 TMA-to-SO Building
• 1.1/6.6 TMA-to-System Interconnects
• May add 1.1/6.5 TMA-to-Handling Equipment
  (articulated man lift attached to stationary TMA
  telescope-level flooring)

TMA Specifications
29
January 19, 2006
30
Safety Requirements

• This will be a safety-first project, from the
  kick-off meeting, through all phases of the Work,
  to the final punch-list close-out effort at the
  Site, and then on into operations
• We require the Contractor to appoint a safety
  officer who has no other role in the project
• We require the Contractor to develop and
  implement a project and site specific Safety and
  Health Management Plan
• Based on Safety Health Specification
  (SPEC-0031)
• Covers work both at Contractors facility and at
  Site

TMA Specifications
30
January 19, 2006
31
Quality Assurance Requirements

• Quality Assurance Management plan is
  requirement of Contract
• Requirements for this plan are spelled out in
  ATST Quality Management for TMA document
• A QA/QC officer is required by Contract

TMA Specifications
31
January 19, 2006